/Engine/Source/Runtime/Landscape/Classes/LandscapeProxy.h
typedef [TSet](API\Runtime\Core\Containers\TSet)< [FGrassComp](API\Runtime\Landscape\FCachedLandscapeFoliage\FGrassComp), [FGrassCompKeyFuncs](API\Runtime\Landscape\FCachedLandscapeFoliage\FGrassCompKeyFuncs) > TGrassSet